The 23-year-old country music star has been awarded the honour by DoSomething.org which named its Top 20 Celebs Gone Good of 2012 this week.
According to the organisaion, the I Knew You Were Trouble singer topped the list after donating €4 million to the County Hall of Fame museum.
She was also recognised for being the youngest recipient of the Ripple of Hope Award from the Robert F. Kennedy Center for her charity work.
Former Disney star Miley Cyrus was named in the number two spot for her work with non-profit animal activist group Saving Spot! Rescue. The organisation finds homes for dogs in kill shelters.
The 20-year-old popstar has also worked with Save The Music Foundation, the Starkey Hearing Foundation and the Make-A-Wish Foundation.
Father-to-be Channing Tatum came in third. The Magic Mike star was acknowledged for his work with the Rainforest Foundation.
Lady Gaga, who started her own non-profit, the Born This Way Foundation, followed at fourth.
Justin Bieber rounded out the top five, honoured for his work with Pencils of Promise and his Believe Charity Drive.